CN104651706A - Anti-corrosion cast iron and manufacturing method thereof - Google Patents

Abstract

The invention discloses an anti-corrosion cast iron and a preparation method thereof. The anti-corrosion cast iron contains the following chemical components in percentage by weight: 2.6%-3.2% of C, 1.6%-2.2% of Si, 0.6%-1.2% of Cu, 0.4-0.8% of Mn, 0.5-1% of Cr, 0.6-1.2% of Ni and the balance of Fe; the preparation method comprises the following steps: adding the raw materials of the chemical components to a medium-frequency induction furnace for smelting; increasing the temperature to the range of 1520 to 1550 DEG C and then performing discharging and casting; casting by use of a sand mold at a temperature ranging from 1400 to 1460 DEG C; clearing sand and polishing the casting after the casting is cooled; performing heat treatment, namely quenching at a temperature within the range of 950 to 1030 DEG C and preserving heat for 2-2.5 hours, and tempering at a temperature within the range of 370 to 530 DEG C and preserving heat for 2-2.5 hours. Compared with the prior art, the time and the cost taken by machining and assembling a cylinder with a cylinder sleeve are reduced, and the production cost is reduced.

Description

Corrosiron and manufacture method

Technical field

The present invention relates to Special Casting Iron manufacturing technology field, especially a kind of preparation method of the corrosiron for carbon dioxide compressor cylinder casting material.

Background technology

Carbon dioxide compressor is widely used in the industry such as food, medicine, because carbon dioxide has certain corrodibility, and the purity of the required carbon dioxide such as food, medicine and contained impurity little; The cylinder body of usual carbon dioxide compressor adopts HT250 cast member, and the method for its rust protection adopts cylinder body edge stainless steel cylinder sleeve, and cylinder body inlays stainless steel cylinder sleeve for the normal carbon dioxide compressor of little cylinder diameter or feasible method mutually; But cylinder diameter is greater than to the cylinder body of 400 millimeters, adopt stainless steel cylinder sleeve to inlay production cost mutually high, assembling difficulty is large; Therefore, development intensity is needed to be applicable to and anti-corrosion cast iron materials.

Summary of the invention

A problem solved by the invention is to provide the chemical composition of the good corrosiron of a kind of corrosion-resistant property.

Another problem solved by the invention is to provide a kind of preparation method of corrosiron.

In order to solve the problem, the present invention adopts the technical scheme of to be: a kind of corrosiron chemical composition percentage: C:2.6% ~ 3.2%, Si:1.6% ~ 2.2%; Cu:0.6% ~ 1.2%; Mn:0.4 ~ 0.8%; Cr:0.5% ~ 1%; Ni:0.6% ~ 1.2%; Surplus is Fe and inevitable trace impurity.

The present invention adopts another technical scheme to be: a kind of preparation method of corrosiron, and it comprises the following steps:

A, be C:2.6% ~ 3.2% by chemical composition, Si:1.6% ~ 2.2%; Cu:0.6% ~ 1.2%; Mn:0.4 ~ 0.8%; Cr:0.5% ~ 1%; Ni:0.6% ~ 1.2%; Surplus is that the raw material of the chemical composition of Fe and inevitable trace impurity adds in medium-frequency induction furnace and melts;

B, temperature rise to 1520 DEG C ~ 1550 DEG C, tapping casting;

C, employing sand mold casting, pouring temperature is 1400 DEG C ~ 1460 DEG C;

After the cooling of D, foundry goods, sand removal is polished;

E, quench treatment, quenching temperature is 950 DEG C ~ 1030 DEG C, air cooling of coming out of the stove after being incubated 2 hours ~ 2.5 hours;

F, temper, tempering temperature is 370 DEG C ~ 530 DEG C, air cooling of coming out of the stove after being incubated 2 hours ~ 2.5 hours.

Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect: the part 1, cast with this corrosiron is by the corrosion test of coupon, reach corrosion resistant requirement, and hardness is HB190-220, reach the hardness requirement of carbon dioxide compressor cylinder body, the carbon dioxide compressor cylinder body produced with this corrosiron comparatively inlays the cylinder body of not steel cylinder sleeve, decreases the processing of cylinder sleeve and the expense needed for general assembly, reduces production cost.

Embodiment

Below in conjunction with example, the invention will be further described:

Embodiment 1:

The preparation method of corrosiron is as follows:

By the chemical composition requirement of this corrosiron various composition joined in medium-frequency induction furnace and melt, treat that molten iron temperature rises to 1520 DEG C ~ 1550 DEG C, tapping casting; Adopt sand mold casting, pouring temperature is 1400 DEG C ~ 1460 DEG C; After foundry goods cooling, spruing, sand removal polishing, deburring; First carry out quench treatment, quenching temperature is 950 DEG C ~ 1030 DEG C, air cooling of coming out of the stove after being incubated 2 hours ~ 2.5 hours; Carry out temper again, tempering temperature is 370 DEG C ~ 530 DEG C, air cooling of coming out of the stove after being incubated 2 hours ~ 2.5 hours.

The chemical composition percentage of corrosiron is as follows:

C:2.6%%, Si:1.6%; Cu:0.6%; Mn:0.4; Cr:0.5%; Ni:0.6%; Surplus is Fe and inevitable trace impurity.

Testing its hardness is HB198.

Embodiment 2 is identical with embodiment 1 with the preparation method of embodiment 3, and its chemical composition is as follows:

Surplus is Fe and inevitable trace impurity.

Claims (2)

1. corrosiron and a preparation method, is characterized in that chemical composition percentage:

C:2.6% ~ 3.2%, Si:1.6% ~ 2.2%; Cu:0.6% ~ 1.2%; Mn:0.4 ~ 0.8%; Cr:0.5% ~ 1%; Ni:0.6% ~ 1.2%; Surplus is Fe and inevitable trace impurity.

2. a preparation method for corrosiron, is characterized in that comprising the following steps:

A, be C:2.6% ~ 3.2% by chemical composition, Si:1.6% ~ 2.2%; Cu:0.6% ~ 1.2%; Mn:0.4 ~ 0.8%; Cr:0.5% ~ 1%; Ni:0.6% ~ 1.2%; Surplus is that the raw material of the chemical composition of Fe and inevitable trace impurity adds in medium-frequency induction furnace and melts;

B, temperature rise to 1520 DEG C ~ 1550 DEG C, tapping casting;

C, employing sand mold casting, pouring temperature is 1400 DEG C ~ 1460 DEG C;

After the cooling of D, foundry goods, sand removal is polished;

E, quench treatment, quenching temperature is 950 DEG C ~ 1030 DEG C, air cooling of coming out of the stove after being incubated 2 hours ~ 2.5 hours;

F, temper, tempering temperature is 370 DEG C ~ 530 DEG C, air cooling of coming out of the stove after being incubated 2 hours ~ 2.5 hours.